Alien

Alien

The start of the scene and throughout all of the shots it is low key lighting and very dim just how it would be if you were one of the characters, making us feel as unprepared and in the dark, literally, as them.

As one of the characters crawls through the tunnel there is the key light shining on his face, which means we can see his face and his expression, but we cannot see what is behind him or surrounding him so anything could be there, much like an enigma code. While he makes his way through the tunnel he carries a torch of fire, which connotes the danger he is in.

Also throughout there is flashing lights, much like a siren or alarm, which really reinforces the danger and tells us that something is wrong.

When the surprise of the scene appears and the light shines onto the alien, this is a huge shock for the audience and character. Which we can tell from the change of the low key lighting and just the key light on the characters face, it then goes very fast and suddenly to the aliens face which is a big juxtaposition between how dark it was to then how light it is which shows how the situation has changed.  The sudden light change not only shows the alien to shock us but obviously brightens the screen for the audience and shocks their eyes just as much as the alien.